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Age of the Basement of the Arctic Alaska–Chukotka Microplate from the Example of the Velitkenai Granite–Metamorphic Dome (Northeastern Russia).

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Title: Age of the Basement of the Arctic Alaska–Chukotka Microplate from the Example of the Velitkenai Granite–Metamorphic Dome (Northeastern Russia).
Authors: Luchitskaya, M. V.1 (AUTHOR) luchitskaya@ginras.ru, Bushueva, D. V.2 (AUTHOR), Mazurkevich, K. N.2 (AUTHOR), Sokolov, S. D.1 (AUTHOR)
Source: Doklady Earth Sciences. May2024, Vol. 516 Issue 1, p819-829. 11p.
Subjects: Basements, Tundras, Geological maps, Geological mapping, Single crystals, Age
Geographic Terms: Arctic regions
Abstract: Аbstract: The basement of Arctic Alaska–Chukotka microcontinent (AAChM) is exposed in the Velitkenai granite–metamorphic dome of Chukotka. U–Th–Pb (SIMS) geochronological study of the orthogneisses of the basement, paragneisses after Paleozoic rocks, and leucogranites of the Velitkenai massif in the central and southwestern parts of this structure was carried out. The Neoproterozoic age of basement orthogneisses (Velitkenai complex) and the Albian age of granitoids of the last stage of the Velitkenai massif were confirmed. The latter coincides with the age of migmatization of orthogneisses. The youngest zircon populations from paragneisses within the Velitkenai complex are from the Cambrian and the Silurian; single zircon crystals contain inherited cores with ages of 1.7 and 1.9 Ga. The correlation of the Neoproterozoic orthogneisses of the Velitkenai granite–metamorphic dome with similar complexes of the other AAChM regions indicates the unity of its basement. It is suggested to enter the Velitkenai metamorphic complex into the legend of the Chukotka series of the third-generation geological map sheets. [ABSTRACT FROM AUTHOR]
Copyright of Doklady Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Age of the Basement of the Arctic Alaska–Chukotka Microplate from the Example of the Velitkenai Granite–Metamorphic Dome (Northeastern Russia).
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  Data: <searchLink fieldCode="DE" term="%22Basements%22">Basements</searchLink><br /><searchLink fieldCode="DE" term="%22Tundras%22">Tundras</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+maps%22">Geological maps</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+mapping%22">Geological mapping</searchLink><br /><searchLink fieldCode="DE" term="%22Single+crystals%22">Single crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Age%22">Age</searchLink>
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  Data: Аbstract: The basement of Arctic Alaska–Chukotka microcontinent (AAChM) is exposed in the Velitkenai granite–metamorphic dome of Chukotka. U–Th–Pb (SIMS) geochronological study of the orthogneisses of the basement, paragneisses after Paleozoic rocks, and leucogranites of the Velitkenai massif in the central and southwestern parts of this structure was carried out. The Neoproterozoic age of basement orthogneisses (Velitkenai complex) and the Albian age of granitoids of the last stage of the Velitkenai massif were confirmed. The latter coincides with the age of migmatization of orthogneisses. The youngest zircon populations from paragneisses within the Velitkenai complex are from the Cambrian and the Silurian; single zircon crystals contain inherited cores with ages of 1.7 and 1.9 Ga. The correlation of the Neoproterozoic orthogneisses of the Velitkenai granite–metamorphic dome with similar complexes of the other AAChM regions indicates the unity of its basement. It is suggested to enter the Velitkenai metamorphic complex into the legend of the Chukotka series of the third-generation geological map sheets. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Doklady Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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              Text: May2024
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